JP5462012B2 - Siphon tube structure - Google Patents

Description

  The present invention relates to a siphon tube structure for taking out a liquid stored in a container.

In general, liquids such as semiconductor high-purity chemicals and general chemicals are filled in containers such as tanks at production plants and shipped with caps (lids) fitted into at least a pair of openings formed in these containers. Has been.
When taking out the liquid stored in this container, first, the cap fitted in the opening of the container is removed, and a plug to which the siphon tube is connected and a plug to which the siphon tube is not connected are respectively attached. Then, the socket to which the liquid feeding hose is connected is connected to the plug to which the siphon tube is connected, and the socket to which the air feeding hose is connected is connected to the plug to which the siphon tube is not connected.

In this state, the liquid in the container was sucked up from the siphon tube to the plug by the pump, and was sent out to the liquid feeding hose connected to the socket. At this time, a gas such as nitrogen was introduced from an air supply hose connected to the other socket so that the inside of the container did not become negative pressure.
As described above, a connector is known as a technique for connecting a socket to a plug with one touch. In a conventional connector, in order to reduce the amount of liquid that cannot be drawn out from the container (hereinafter referred to as “residual liquid amount”), an opening of a siphon tube that extends toward the bottom surface of the container is disposed in the vicinity of the bottom surface. That is, the tip of the siphon tube is brought into contact with the bottom surface of the container, and the liquid in the container is taken out from an opening (suction port) that opens near the lower end of the siphon tube or near the lower end. Some conventional connectors include a liquid feeding hose for sucking liquid and an air feeding hose for taking in gas so that both hoses can be connected to one connector.

In addition, some containers that are used with a connector attached have a concave portion formed by bending the bottom surface downward (outside). The connector attached to the container is used by bending the siphon tube at the lower end side in the horizontal direction by approximately 90 degrees so that the opening at the tip of the siphon tube is deepest in the recess formed in the bottom surface of the container. The amount of the remaining liquid can be reduced by arranging in the region.
Further, in a connector in which the lower end portion of the siphon tube is curved, a structure has been proposed in which the coupling portion and the connector main body are connected so as to be relatively rotatable about the central axis. In such a connector, since the connector can be installed in the container without rotating the siphon tube fixed to the plug portion arranged in the connector body, the tip of the siphon tube is placed in a region (concave portion) where the liquid remains in the container. It becomes easy to arrange | position, therefore, the residual liquid amount in a container can be reduced. (For example, see Patent Document 1)

JP 2006-182400 A

By the way, there are many molded products of resin in a container for taking out liquid using the siphon tube connected to the connector described above, and there is a predetermined dimensional tolerance in the depth of the container. For example, in the case of a drum-shaped container having a capacity of 200 liters, a tolerance of ± 8 mm is recognized for a depth dimension of 1000 mm, and therefore there is a maximum dimension difference of 16 mm in the depth dimension.
On the other hand, the length of the conventional siphon tube is constant within a predetermined dimensional tolerance, and accordingly, the dimensional difference cannot be absorbed following the dimensional tolerance on the container side. For this reason, the length of the siphon tube can be adapted to a large number of containers having different depth dimensions within tolerances, so that it can be used for a container having the smallest (shallow) depth in general. Therefore, the length may be insufficient to bring the tip portion into contact with the bottom surface of the container. That is, when the siphon tube is a general-purpose product, it is difficult to adjust and optimize the siphon tube length for each container having a dimensional tolerance at the time of manufacturing the siphon tube, which is not realistic.

However, when the conventional siphon tube described above is used, the opening provided at the tip of the siphon tube does not reach the bottom of the container in the case of the deepest (deep) container within the tolerance. Has a residual liquid amount that cannot be removed. For example, in the case of the 200 liter drum type container described above, if a maximum dimensional difference of about 16 mm occurs, the residual liquid amount is about 4 liters.
For this reason, when handling liquids such as expensive chemicals, it is desired to reduce the amount of residual liquid due to the fact that the siphon tube cannot reach (contact) the bottom of the container.

From such a background, the siphon tube structure in which the siphon tube length follows the at least within the range of the dimensional tolerance with respect to the container having the tolerance in the depth dimension, so that the dimensional difference can be absorbed and brought into contact with the bottom of the container. desired. In other words, we developed a siphon tube structure that can follow the minimum to maximum depth within the dimensional tolerance of the container, so that the opening at the tip of the siphon tube can always reach (contact) the bottom of the container and cannot be removed. It is desirable to reduce or eliminate the amount of residual liquid remaining in the container.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an siphon tube structure connected to a connector attached to an opening on the container side, and an opening provided at the tip of the siphon tube. Another object of the present invention is to provide a siphon tube structure that can always reach the vicinity of the bottom of the container at least within the tolerance defined in the depth dimension of the container.

In order to solve the above problems, the present invention employs the following means.
In the siphon tube structure according to the present invention, a connector is attached to a cylindrical nozzle provided in an upper portion of a container for storing liquid, and the siphon tube connected to the connector is inserted to the vicinity of the bottom in the container, and the lower end of the siphon tube A siphon tube structure for drawing out liquid in the container from an inlet opening near a portion, wherein the siphon tube is provided with an expansion / contraction portion whose axial length is variable, and the expansion / contraction portion limits the expansion / contraction direction The guide portion includes a drain hole that opens to the liquid receiving surface .

According to the siphon tube structure of the present invention, since the siphon tube is provided with the expansion / contraction portion that can change the axial length, the siphon tube itself is the shaft even if the depth dimension in the container fluctuates within the dimensional tolerance. It is possible to always reach the bottom of the container by expanding and contracting in the direction. That is, the length of the siphon tube provided with the expansion / contraction portion is at least the maximum depth allowed for the depth dimension in the container in the extended state, and the minimum depth to the maximum depth within the dimensional tolerance. Following this, the lower end portion of the siphon tube always reaches (contacts) the bottom surface of the container.
In this case, the structure of the expansion / contraction part suitable includes a bellows structure part provided partially, an inlay structure with an O-ring interposed, and the like, and the compressive force generated when the lower end part of the siphon tube abuts the bottom of the container As long as it contracts and grows under its own weight.

Furthermore, since the expansion / contraction part is provided with a guide part that limits the expansion / contraction direction, it is possible to prevent misalignment of the expanding and contracting siphon tube. And since this guide part is provided with the drain hole opened to a liquid receiving surface, the liquid which dipped in the guide part can be flowed down in a container and returned. Therefore, the dripping liquid can be prevented from solidifying between the guide portion and the stretchable portion.

  In the above invention, it is preferable that the suction port is continuously open from the front end opening of the siphon tube to the side surface of the lower end portion, so that substantially the entire amount reaches the vicinity of the liquid level of the front end opening in contact with the bottom surface of the container. The liquid can be reliably removed.

In the above invention, the suction port is preferably opened on a side surface in the vicinity of the lower end portion having a desired height from the tip opening of the siphon tube, so that the sediment settles and stays on the bottom surface of the container. Even when handling various liquids, the amount of sediment taken out together with the liquid can be minimized by appropriately setting the height of the suction port.
In this case, it is preferable that the siphon pipe is divided into upper and lower portions with the lower end position of the suction port as a boundary, thereby more reliably preventing or suppressing the sediment in the container from being taken out together with the liquid. . The above-described upper and lower divisions are effective, for example, by sealing with a stopper attached to the lower end side from the lower end position of the suction port that opens on the side surface of the siphon tube, or with a partition plate attached to the inside of the siphon tube. In addition, the upper part of the suction port inside the siphon tube can be reliably separated from the opening of the tip, thereby preventing the flow of liquid and sediment.

In the above invention, the suction part is a tip opening in which the tip part of the siphon tube is bent at approximately 90 degrees in the horizontal direction, and the tip opening is provided near the deepest part of the recess provided in the bottom part of the container. It is preferable to arrange the liquids, whereby the liquid can be collected near the deepest part in the container, and almost the entire amount of liquid in the container can be taken out.
In this case, the connector for fixing the upper end portion of the siphon tube is attached by being inserted into the cylindrical nozzle and attached to a coupling portion having a screw portion screwed with a screw portion on the container side formed in the cylindrical nozzle, A detent mechanism that includes a coupling portion and a main body that can be assembled by sharing a central axis, and that prevents the main body, to which the upper end portion of the siphon tube is fixed, from rotating with respect to the cylindrical nozzle; It is preferable to prevent the fluctuation of the rotational direction position of the siphon tube inserted from the cylindrical nozzle into the container (the direction of the curved siphon tube), and minimize the amount of residual liquid in the container. The liquid can be sucked out while being held in a predetermined position and direction.

According to the siphon tube structure of the present invention, since the siphon tube is provided with the expansion / contraction portion that makes the axial length variable, even if the depth dimension in the container fluctuates within the dimensional tolerance, the siphon tube itself remains in the axial direction. Dimensional difference can be absorbed by expanding and contracting. That is, the siphon tube contracts due to the compressive force acting in the axial direction when the tip (lower end) abuts against the bottom of the container, so that the telescopic part expands and contracts in the axial direction depending on the presence or absence of the compressive force. Change the axial length.
For this reason, the tip of the siphon tube has a length that always reaches the vicinity of the bottom of the container, and the siphon tube length is allowed to follow at least within the range of the dimensional tolerance with respect to the container having a tolerance in the depth dimension. It becomes possible to absorb the dimensional difference. Therefore, the tip of the siphon tube always reaches the vicinity of the bottom of the container and can come into contact with the surface of the bottom of the container.

Thus, within the range of dimensional tolerance of the container, since it becomes a siphon tube structure that can be expanded and contracted following the minimum depth to the maximum depth, the tip of the siphon tube always reaches (contacts) the bottom of the container, Depending on the position of the suction port, the liquid in the container can be reliably taken out to almost the entire amount or to a desired liquid level.
As a result, for example, when the suction port is continuously provided on the side surface of the lower end portion from the tip opening of the siphon tube, the remaining liquid amount remaining in the container can be reliably reduced or eliminated. In addition, if the suction port is provided on the side surface near the lower end that is at a desired height from the tip opening of the siphon tube, the sediment that settles and stays on the bottom surface of the container is minimized and the liquid in the container is removed. Can be taken out to the maximum.

It is sectional drawing of the principal part which shows the siphon tube structure which concerns on the 1st Embodiment of this invention, The state where the expansion-contraction part is extended on the paper surface left side, and the expansion-contraction part is the state which contracted the right side of the paper surface. It is AA sectional drawing of FIG. 1, and the drain hole provided in the guide part is shown. It is a fragmentary sectional front view which shows the state which attached the siphon tube of this invention to the container. In the siphon tube structure according to the first embodiment, it is a cross-sectional view of a main part showing a first modified example related to the suction port, the left side of the paper is in a state where the expansion / contraction part is extended, and the right side of the paper is in a state where the expansion / contraction part is contracted. . It is sectional drawing of the principal part which shows the siphon tube structure which concerns on the 2nd Embodiment of this invention, The state where the expansion-contraction part is extended on the paper surface left side, and the expansion-contraction part is the state which contracted the right side of the paper surface. In the siphon tube structure according to the second embodiment, it is a cross-sectional view of a main part showing a first modified example related to the suction port, the left side of the paper surface is in a state where the stretchable portion is extended, and the right side of the paper surface is in a state where the stretchable portion is contracted. . In the siphon pipe structure which concerns on the 3rd Embodiment of this invention, it is a partial cross section front view which shows the lower end part side of the container bottom part and the siphon pipe attached to the container as a 2nd modification regarding an inlet. It is sectional drawing which shows the state attached to the container as an example of the connector (a screw is an upper part of a seal part) which concerns on 3rd Embodiment shown in FIG. 7, The state before connecting a coupling part to a cylindrical nozzle in the upper part In the lower part, a state where the coupling part is connected to the cylindrical nozzle and fixed is shown. It is BB sectional drawing of FIG. 8, and the detent | locking structure is shown.

A siphon tube structure according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 3 is a diagram illustrating a state in which the siphon tube 20 connected to the connector 10 is attached to the upper portion of the container 50. Two cylindrical nozzles 51 </ b> A and 51 </ b> B serving as openings are formed on the surface that closes the upper portion of the container 50 that stores the liquid. One cylindrical nozzle 51A is provided with a connector 10 for drawing out liquid. A socket (not shown) having a liquid extraction hose (not shown) is detachably attached to the connector 10. A gas flow connector, socket, and hose (not shown) are attached to the other opening 51B.

When the liquid is taken out from the container 50, the other end of the hose on the cylindrical nozzle 51A side is connected to a pump facility (not shown). For example, as shown in FIG. Insert. A suction port 22 that opens near the lower end of the tube main body 21 is provided, and the liquid in the container 50 is sucked out from the suction port 22 by a pump. At this time, in order to prevent the inside of the container 50 from becoming a negative pressure on the side of the gas distribution cylindrical nozzle 51B, the container 50 is connected from a socket (not shown) and a hose (not shown) attached to a connector (not shown). Supply gas to the inside.
Note that the gas distribution connector and socket are not limited to the above-described configuration. For example, a gas distribution system may be connected to a liquid drawer socket to supply gas into the container 50.

<First Embodiment>
Below, 1st Embodiment is described based on FIG.1 and FIG.2 about the siphon tube structure which concerns on this invention. FIG. 1 is a cross-sectional view of a state in which the connector 10 to which the siphon tube 20 according to the present embodiment is connected is attached to the cylindrical nozzle 51A, and the left side of the drawing shows a state in which an expansion / contraction section 30 described later is extended. The right side shows a state where the stretchable portion 30 is shrunk.
The connector 10 includes a connector main body 11 which is a main body portion of the connector 10, a coupling portion 12 coupled to the container 50 by screwing with a female screw portion 52 formed in the cylindrical nozzle 51A of the container 50, and the socket described above. And a siphon tube 20 that is fixedly connected to the plug portion 13 and extends toward the inside of the container 50. That is, the siphon tube 20 is a long tubular member connected to the plug portion 13 of the connector 10, and the length reaches the container bottom surface 50 a in a state where the connector 10 is attached to the cylindrical nozzle 51 </ b> A of the container 50. It is set to be possible.
In addition, the code | symbol 53 in a figure is an external thread part, and the cap which plugs up the opening of 51 A of cylindrical nozzles is attached.

  The siphon tube 20 described above includes an extendable portion 30 whose axial length is variable. In the illustrated configuration example, a bellows structure portion 31 is connected in the vicinity of the lower end portion of the plug portion 13, and the bellows structure portion 31 functions as the expansion / contraction portion 30. That is, the siphon tube 20 according to the present embodiment has the bellows structure portion 31 interposed between the plug portion 13 and the tube body 21, and the bellows structure portion 31 expands and contracts in the axial direction of the siphon tube 20. Accordingly, it is possible to follow the dimensional tolerance of the depth dimension allowed for the container 50 by making the axial length variable. In other words, the bellows structure portion 31 has a minimum expansion / contraction length H ′ that is substantially the same as the container depth tolerance range H of the container 50 shown in FIG. The difference can be absorbed.

More specifically, in the siphon tube structure of the present embodiment, the expansion / contraction portion 30 of the bellows structure portion 31 whose axial length is variable is provided in the siphon tube 20, so that the depth dimension in the container 50 is a dimensional tolerance. The siphon tube 20 itself expands and contracts in the axial direction even if it fluctuates within the range, so that it can always reach the vicinity of the container bottom 50a of the container 50.
That is, the length of the siphon tube 20 provided with the bellows structure portion 31 is a total value of the length of the tube main body 21 and the bellows structure portion 31 of which the length does not change. If the length that can accommodate (reach) the maximum depth allowed for the depth dimension in the container 50 is secured and a necessary expansion / contraction length is provided, the minimum depth to the maximum within the dimensional tolerance Following the depth, the lower end portion of the siphon tube 20 can always reach (contact) the container bottom surface 50a.

  In other words, as shown on the left side of FIG. 1, in the state where the depth dimension of the container 50 has the maximum allowable value and the maximum depth, at least the bellows structure portion 31 is in a state of extending to the maximum. Therefore, the lower end opening of the tube body 21 is in contact with the container bottom surface 50a. For this reason, as shown on the right side of FIG. 1, the lower end of the tube body 21 abuts against the container bottom surface 50a until at least the depth dimension of the container 50 has the minimum allowable value and reaches the minimum depth. Therefore, as the depth dimension decreases, the bellows structure portion 31 is compressed and contracted. As a result, the total length of the siphon tube 20 is shortened to absorb the dimensional tolerance of the depth dimension allowed for the container 50.

At this time, if the suction port 22 described above is continuously open from the tip opening of the siphon tube to the lower end side surface, that is, if it is continuously open from the tip opening of the tube main body 21 to the lower end side surface. Thus, almost the entire amount of liquid can be reliably taken out to almost the liquid level of the tip opening that is in contact with the container bottom surface 50a with almost no remaining liquid amount.
In the above-described embodiment, the stretchable portion 30 is the bellows structure portion 31, but is not limited thereto. As another suitable stretchable part structure, there is an inlay structure in which an O-ring is interposed, that is, a double cylinder structure in which an axially slidable inner cylinder and an outer cylinder are sealed with an O-ring, and the like. The lower end portion of the container may be compressed by receiving a compressive force generated by contacting the container bottom surface 50a, and may be extended by its own weight.

  By the way, in the embodiment of FIG. 1 described above, the bellows structure portion 31 that becomes the stretchable portion 30 includes the guide portion 40 that limits the stretchable direction. The guide portion 40 limits the expansion and contraction of the bellows structure portion 31 in the axial direction and prevents the bellows from being bent, and the like. The guide portion 40 has a truncated cone-shaped connection portion 41 and a cylindrical guide body 42. And.

  The connecting portion 41 has a truncated cone shape (funnel shape) with a small diameter on the lower end side, and the cylindrical portion 41b provided on the upper end side of the bottom portion forming the inclined surface 41a serving as the liquid receiving surface is screwed or the like. It is fixedly attached to the connector main body 11. The connecting portion 41 is not limited to the illustrated truncated cone shape. For example, the connecting portion 41 may be provided with a substantially horizontal donut-shaped bottom portion (liquid receiving surface) at the lower end portion of the cylindrical portion 41b.

  The guide body 42 is a cylindrical member such as a resin having rigidity. The guide main body 42 does not hinder expansion / contraction of the expansion / contraction portion 30 up to the position of the tube main body 21 in a state where the bellows structure portion 31 is most extended so that the cylindrical member surrounds the outer peripheral portion of the bellows structure portion 31. It is installed in consideration of. The through-hole 43 through which the tube main body 21 passes through the lower end portion of the guide main body 42 does not prevent the tube main body 21 from sliding in the axial direction due to the expansion and contraction of the bellows structure portion 31. In order to minimize misalignment, it is desirable to have an inner diameter that is slightly larger than the outer diameter of the tube body 21.

  By providing such a guide part 40, it is possible to prevent the siphon tube 20 that expands and contracts from being misaligned, and therefore to effectively and reliably utilize the expansion and contraction length of the expansion and contraction part 30 such as the bellows structure part 31. Can do.

  Further, the above-described guide portion 40 includes a drain hole 44 that opens to the bottom liquid receiving surface formed above the guide main body 42. The drain hole 44 prevents a liquid such as a chemical liquid that is liable to solidify when the socket is attached or detached from reaching the expansion / contraction part 30 such as the bellows structure part 31 through the guide part 40. The liquid dripping into the container 50 is caused to flow down into the container 50 and returned. For this reason, the liquid flowing down the guide part 40 is not solidified between the guide part 40 and the expansion / contraction part 30, and therefore, the expansion / contraction function of the expansion / contraction part 30 can be prevented from being impaired by the solidified liquid. In the illustrated configuration example, for example, as shown in FIG. 2, four drain holes 44 are provided in the circumferential direction, but the present invention is not limited to this.

The first modification shown in FIG. 4 is obtained by changing the position of the suction port 22 provided in the siphon tube 20 described above. In the following description, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In the first modified example, the suction port 22A is opened on the side surface in the vicinity of the lower end portion having a desired height from the tip opening of the siphon tube 20A. In other words, the suction port 22A in this case is such that the lower end portion of the suction port 22A is at a height h from the opening of the distal end of the pipe body 21A. In other words, the lower end portion of the suction port 22A is at a height h from the container bottom surface 22a. It is provided in the side surface used as the lower end part side of 21 A of pipe main bodies.

The above-described height h is preferably determined in consideration of the staying height of the sediment when handling a liquid in which the sediment sinks and stays on the container bottom surface 50a of the container 50. That is, when handling a liquid in which the sediment sinks and stays on the container bottom surface 50a, the lower end of the suction port 22A that opens to the pipe body 21A may be set to be slightly higher than the sediment retention height. .
If such an inlet 22A is employed, the amount of sediment taken out from the container 50 together with the liquid can be minimized by appropriately setting the height of the inlet 22A according to the properties of the liquid.

The siphon tube 20A provided with the suction port 22A described above is desirably divided into upper and lower parts with the lower end position of the suction port 22A as a boundary in order to more reliably prevent the sediment from being taken out together with the liquid.
Specifically, the distal end side of the tube main body 21A lower than the lower end portion of the suction port 22A is sealed by press-fitting and attaching a plug 23 such as rubber. In this case, the material of the plug 23 may be appropriately selected depending on the properties of the liquid.

In this way, the inlet for sucking the liquid in the container 50 into the siphon tube 20A is limited to the suction port 22A, so that the liquid inflow from the opening at the front end is removed, so that the liquid is taken out together with the liquid. The amount of sediment is reduced.
The above-described upper and lower divisions are not limited to sealing by press-fitting the plug 23. For example, a partition plate may be attached and sealed inside the pipe body 21A constituting the siphon pipe 20A.

<Second Embodiment>
Next, a second embodiment of the siphon tube structure according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part similar to embodiment mentioned above, and the detailed description is abbreviate | omitted.
In this embodiment, the bellows structure part 31 which becomes the expansion-contraction part 30A of the siphon tube 20 does not include the guide part 40 described above on the outer peripheral part. For this reason, the expansion and contraction of the bellows structure portion 31 is limited to the axial direction, and bending of the bellows subjected to compression cannot be prevented, but the depth dimension of the container 50 is the same as in the above-described embodiment. Tracking within tolerance is possible.

Further, the first modification of the present embodiment shown in FIG. 6 employs the same suction port 22A as the modification shown in FIG. Accordingly, the suction port 22A in this case is provided on the side surface of the lower end portion side of the tube main body 21A so that the lower end portion of the suction port 22A has a height h from the opening of the distal end of the tube main body 21A. As a result, by appropriately setting the height of the suction port 22A according to the properties of the liquid, it is possible to minimize the amount of precipitate taken out from the container 50 together with the liquid.
In this modification as well, in order to more reliably prevent the sediment from being taken out together with the liquid, it is desirable that the upper and lower portions of the suction port 22A are divided by the plug 23 or the like as a boundary.

<Third Embodiment>
Finally, a third embodiment of the siphon tube structure according to the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part similar to embodiment mentioned above, and the detailed description is abbreviate | omitted.
The suction portion 22B of this embodiment is a tip opening in which the tip portion of the siphon tube 20B is bent approximately 90 degrees in the horizontal direction. In this case, the container 50A is provided with a recess 50b which is the deepest part in order to collect the liquid in the container 50A at the bottom. That is, in the vicinity of the deepest portion of the recess 50b provided at the bottom of the container 50A, the tip opening of the siphon tube 20B having a curved tip is disposed as the suction port 22B, so that it is collected near the deepest portion in the container 50A. Almost all of the liquid can be taken out. In addition, the siphon tube 20B of the present embodiment includes a guide portion 40 as necessary, as well as the extendable portion 30 of the above-described embodiment.

In the siphon tube 20B configured as described above, the connector 10A that fixes the upper end portion of the siphon tube 20B is provided with a detent mechanism so that the direction of the curved tip opening is surely aligned with the recess 50b. desirable.
Here, based on FIG.8 and FIG.9, an example of the rotation prevention mechanism 60 is shown and demonstrated. In FIG. 8, a connector main body (main body) 11 is formed in a substantially bottomed cylindrical shape, and a plug portion 13 is integrally formed therein. In addition, a coupling portion 12 formed in a substantially cylindrical shape is provided on the opening end side of the connector main body 11, and the coupling portion 12 can rotate around the central axis C of the connector main body 11 and the coupling portion 12. It has become.

On the outer peripheral surface of the connector main body 11, a flange portion 14 that protrudes radially outward is formed. The flange portion 14 includes an O-ring 15 that is a sealing member disposed on a surface (lower surface in the drawing) on the siphon tube 20B side. The O-ring 15 prevents the liquid in the container 50 from leaking when the connector main body 11 is press-fitted into the cylindrical nozzle 51A.
On the inner peripheral surface of the connector body 11 on the opening end side, there is provided a main body side protrusion 16 that protrudes radially inward (axial center side) over the circumferential direction. The main body side protrusion 16 is formed to engage with the coupling portion 12.

The coupling portion 12 is formed with a male screw portion 12a that is screwed with the female screw portion 52 of the cylindrical nozzle 51A on the outer peripheral surface. The lower end of the outer peripheral surface protrudes radially outward in the circumferential direction. A coupling portion side protrusion 17 that engages with the protrusion 16 is formed.
The outer diameter of the coupling portion side projection 17 is formed larger than the inner diameter of the main body side projection 16, and the coupling portion side projection 17 is engaged with the main body side projection portion 16 by press-fitting the coupling portion 12 into the connector body 11. Yes. Therefore, the coupling portion 12 and the connector main body 11 are engaged with each other so as to be rotatable about the central axis C. Further, the coupling portion 12 is formed on the connector main body 11 side, and the upper end portion becomes the main body side protrusion 16. The range limited by the recess 18 can be slid in the vertical direction.

The plug portion 13 is formed in a substantially cylindrical shape, and is formed integrally with the bottom surface of the connector main body 11 as shown in FIG. 8, and the inside thereof is a flow hole 13a through which liquid flows. Further, on the outer peripheral surface of the plug portion 13, a cap screw portion 12 b that engages with a plug cap (not shown) for preventing liquid outflow is formed on the lower end side, and further, an annular locking member that engages with the socket. A groove 12c and a locking protrusion 12d are formed in the vicinity of the intermediate portion. The plug cap is removed from the plug portion 13 when the socket is attached to the connector 1, and is attached to the plug portion 13 in other cases to prevent the fluid from flowing out.
Further, the siphon tube 20B, which is the tubular member described above, is connected to the lower end portion of the plug portion 13 via the expansion / contraction portion 30 to form a liquid flow path that communicates with the flow hole 23 and takes out the liquid from the tip opening 9a. .

In the present embodiment, a detent mechanism 60 is provided to prevent the connector body 11 having the upper end portion of the siphon tube 20B from rotating relative to the cylindrical nozzle 51A with respect to the connector 10 described above.
The anti-rotation mechanism 60 is one set or a plurality of sets of concave and convex engaging portions and / or chamfered engaging portions formed in the cylindrical nozzle 51 </ b> A and the connector main body 11. That is, when the anti-rotation mechanism 60 includes a plurality of sets of concave and convex engaging portions and chamfered engaging portions, a plurality of sets of concave and convex engaging portions only, a plurality of sets of chamfered engaging portions, or a concave and convex portion Any of a plurality of combinations of the engaging portion and the chamfered engaging portion may be used.

The rotation preventing mechanism 60 of the present embodiment shown in FIG. 9 is composed of one convex portion 61 provided on the inner peripheral surface of the cylindrical nozzle 51 </ b> A and one concave portion 62 provided on the outer peripheral surface of the connector main body 11. It is another set of concave and convex engaging portions. In this case, the convex portion 61 and the concave portion 62 have substantially the same cross-sectional shape, and the convex portion 61 enters and engages with the concave portion 62 by press-fitting the connector main body 11 into the cylindrical nozzle 51A.
As a result, when the connector 10 is fixed by screwing the coupling portion 12 into the cylindrical nozzle 51A of the container 50, the connector main body 11 and the siphon tube are caused by the action of the detent mechanism 60 in which the convex portion 61 and the concave portion 62 engage. 20 can be prevented from being carried around.

  Therefore, the siphon tube 20B inserted by pressing the connector main body 11 into the container 50 from the cylindrical nozzle 51A can prevent the rotational direction position (the bending direction of the curved siphon tube 20B) from being changed due to the rotation. As a result, the suction port 22B of the siphon tube 20B is reliably inserted to a predetermined position in the container 50, that is, the liquid can be taken out by being positioned in the concave portion 50b which is the deepest portion. In other words, by providing the anti-rotation mechanism 60 for the connector main body 11, the siphon tube 20B is held at a predetermined position that minimizes the amount of remaining liquid in the container 50, and the liquid in the container 50 is sucked out to the maximum. be able to.

  In such a detent mechanism 60, when there are one set of concave and convex engaging portions, it is desirable to match the circumferential position of the cylindrical nozzle 51A provided with the convex portion 61 with the bending direction of the siphon tube 20B. That is, when the connector body 11 is press-fitted into the cylindrical nozzle 51A by inserting the circumferential position where the convex portion 61 and the concave portion 62 are provided in line with the bending direction of the siphon tube 20B, the anti-rotation mechanism 60 is inserted. The convex portion 61 serves as a guideline for determining the insertion direction of the siphon tube 20B having a curved tip, and the operator can easily recognize the direction (curving direction) of the siphon tube 20B inserted into the container 50.

  According to each of the embodiments of the present invention described above, since the expansion / contraction part 30 having a variable axial length is provided in the siphon tube 20, even if the depth dimension in the container 50 varies within the dimensional tolerance, The tube itself can expand and contract in the axial direction to absorb the dimensional difference. That is, the siphon tube 20 is contracted by receiving a compressive force acting in the axial direction when the tip portion comes into contact with the container bottom surface 50a, so that the expandable portion 30 expands and contracts in the axial direction depending on the presence or absence of the compressive force. The length changes. For this reason, the tip portion of the siphon tube 20 has a length that always reaches the vicinity of the bottom of the container 50, and the siphon tube length is at least within the range of the dimensional tolerance with respect to the container 50 having a tolerance in the depth dimension. It is possible to absorb the dimensional difference by following it. Therefore, the tip of the siphon tube 20 always reaches the vicinity of the bottom of the container 50 and can come into contact with the surface of the container bottom 50a.

Thus, since the siphon tube structure can be expanded and contracted following the minimum depth to the maximum depth within the range of the dimensional tolerance of the container 50, the tip end portion of the siphon tube 20 always reaches the container bottom 50a and is inhaled. Depending on the position of the mouth 22, it is possible to reliably take out almost all of the liquid in the container 50 or to a desired liquid level, thereby reducing the amount of remaining liquid.
Further, when the suction port 22A is provided on the side surface in the vicinity of the lower end that is at a desired height from the tip opening of the siphon tube 20, it is possible to minimize the sediment that has settled and stays on the bottom surface 50a of the container together with the liquid. The liquid inside can be taken out to the maximum.
The present invention is not limited to the above-described embodiment. For example, for the connector main body 3 and the plug portion 7 described above, the gist of the present invention can be appropriately selected as an integral structure or a combined structure of separate parts. Changes can be made as appropriate without departing from the scope.

10 Connector 11 Connector body (main body)
12 coupling portion 13 plug portion 14 flange portion 20, 20A, 20B siphon tube 21, 21A tube main body 22, 22A, 22B suction port 23 plug 30 expansion / contraction portion 31 bellows structure portion 40 guide portion 44 drain hole 50, 50A container 50a container bottom surface 50b Concave part 51A Cylindrical nozzle 60 Anti-rotation mechanism 61 Convex part 62 Concave part

Claims (4)

A connector is attached to a cylindrical nozzle provided at the top of a container for storing liquid, and a siphon tube connected to the connector is inserted to the vicinity of the bottom of the container, and the suction port that opens to the vicinity of the lower end of the siphon tube. A siphon tube structure for drawing out the liquid in the container,
The siphon tube is provided with an expansion / contraction portion whose axial length is variable ,
The siphon tube structure according to claim 1, wherein the extendable portion includes a guide portion that limits an expansion and contraction direction, and the guide portion includes a drain hole that opens to a liquid receiving surface . 2. The siphon tube structure according to claim 1, wherein the suction port continuously opens from a front end opening of the siphon tube to a side surface of a lower end portion. 2. The siphon tube structure according to claim 1, wherein the suction port opens on a side surface in the vicinity of a lower end portion having a desired height from a tip opening of the siphon tube. 4. The siphon tube structure according to claim 3 , wherein the siphon tube is divided into upper and lower portions with a lower end position of the suction port as a boundary.

Images